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| Chinese | English |
| 从沉淀室排出的在养殖单元底部积累的固体物质和水的混合物。污水处理中：在大部分液体从污水中被除去后保留下来的泥泞、半固体沉淀物. | sludge |
| 半制造产品 | semimanufactured product Product that has undergone a partial processing and is used as raw material in a successive productive step (通过特别处理制造的产品并在后续生产中用作原材料。) |
| 半导体 | semiconductor A solid crystalline material whose electrical conductivity is intermediate between that of a metal and an insulator and is usually strongly temperature-dependent (一种固体透明的物质，它的电传导性在金属和绝缘体之间并且其传到性能依赖于温度。) |
| 半工业性工厂 | pilot plant |
| 半干旱陆地生态系统 | semi-arid land ecosystem The interacting system of a biological community and its non-living environmental surroundings in regions that have between 10 to 20 inches of rainfall and are capable of sustaining some grasses and shrubs but not woodland (生态社区中相互影响的系统，它的无生命地区的降雨量在10到20英寸之间，这只能够草和灌木生存但树木不能存活。) |
| 半数致死时间 | lethal dose-50 time |
| 半液体肥料 | semi-liquid manure No definition needed (不需要定义。) |
| 半致死浓度 | median lethal concentration |
| 半致死浓度 | lethal concentration to 50% |
| 半衰期 | half-life The time required for one-half the atoms of a given amount of radioactive material to undergo radioactive decay (定量的辐射性物质，其原子之数量经由辐射衰退为原来的一半所需的时间。) |
| 半金属 | semi-metal An element having some properties characteristic of metals and others of non-metals. Many metalloids give rise to an amphoteric oxide (e.g. arsenic or antimony) and many are semiconductors (有一些金属特性和非金属特性的元素。很多非金属物质产生两性的氧化物(例如砷或锑)并且很多是半导体。) |
| 机载式南半球臭氧实验 | airborne southern hemisphere ozone experiment |